Register Now

In order to be able to post messages on the SailNet Community forums, you must first register. Please enter your desired user name, your email address and other required details in the form below.Please note: After entering 3 characters a list of Usernames already in use will appear and the list will disappear once a valid Username is entered.

User Name:

Password

Please enter a password for your user account. Note that passwords are case-sensitive.

Password:

Confirm Password:

Email Address

Please enter a valid email address for yourself.

Email Address:

OR

Log-in

User Name

Password

Remember Me?

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.

Additional Options

Miscellaneous Options

Automatically parse links in text

Automatically embed media (requires automatic parsing of links in text to be on).

Automatically retrieve titles from external links

Click here to view the posting rules you are bound to when clicking the'Submit Reply' button below

Topic Review (Newest First)

01-23-2013 11:59 AM

chucklesR

Re: Bayliner Bucaneer Cruise Speed Under Power

Keep in mind that while diesels like to work, they like to work at no more than 90% continuously (recreational boats are fitted with either light or medium duty diesels, not the tug boat type continuous rated ones).

Your MD7A is rated at 13hp max at 2600 RPM. I'd not run it above 2340 RPM for more than 30 minutes.
If the Volvo and Bayliner engineers fit it out right you should reach your hull speed (
Your B 275 is 24.33 feet at the water line, max speed is 6.65 knots) at that RPM.

Volvo gives two different reduction ratio's - you didn't say you have the S drive (folder) so I'll go with the 1.91 ratio of the other model.

yes, this is not a gas engine. Diesels thrive on running at WOT fully loaded. It is what they are meant to do

Not sure I want to run at WOT for extended periods, but you are certainly safe running at 85%.

01-23-2013 09:10 AM

mad_machine

Re: Bayliner Bucaneer Cruise Speed Under Power

yes, this is not a gas engine. Diesels thrive on running at WOT fully loaded. It is what they are meant to do

01-22-2013 10:50 PM

chuck53

Re: Bayliner Bucaneer Cruise Speed Under Power

Assuming a nice clean bottom and running gear and that your motor is running at peak, you are slightly over propped but not enough to be concerned with or to make a change. Bump up your cruise RPM another 2-300 RPM's and you will be fine with a little more speed.

01-22-2013 10:22 PM

itsme1414

Re: Bayliner Bucaneer Cruise Speed Under Power

This is what I found in the manual. Max. engine speed: MD7A 43.4 rev/sec (2600 rpm).

01-22-2013 10:04 PM

chuck53

Re: Bayliner Bucaneer Cruise Speed Under Power

You need to match your prop to the engine. if the mfg has rated your engine to run 2500 RPM's then you have the right prop. So if 2500 is correct, you can easily cruise at 2000-2100 to get more speed and not damage the engine.
Yes, you can put on a larger prop that will give you more speed at 1800, but you will be overloading your engine and only have a WOT of 22-2300. Overloading an engine is NOT a good thing. if you wanted you could put an even larger prop on that will bring your WOT down to 1800, but then you would be running at WOT.
Again, the main question is, what is the mfg's rated WOT for your engine. Until you know the answer to that question, don't do a thing.

01-22-2013 09:06 PM

itsme1414

Re: Bayliner Bucaneer Cruise Speed Under Power

What I was wondering is would changing props increase my speed at 1800 RPM cruise speed from 4.7 mph to like 6 mph or is it even worth the money to increase or if I would notice any difference in 1800 rpm cruise speed?

01-22-2013 07:05 PM

mad_machine

Re: Bayliner Bucaneer Cruise Speed Under Power

yes.. diesels can run close to Redline for hours on end without issue. I used to drive a truck for a living and running at Redline or even slightly above for 250,000 miles certainly did not hurt the engine of the truck I drove in the slightest

01-22-2013 05:58 PM

Faster

Re: Bayliner Bucaneer Cruise Speed Under Power

Time to 'get nautical' and set your GPS for knots!

If you can't achieve rated RPM it's likely you're 'overpropped' and repitching may get you back up the the max revs. It may not give you any more speed.

Using GPS for speed can be deceiving, esp if any current is a possibility. Around here if you time things wrong you could be doing hullspeed through the water and a GPS will show close to zero.

01-22-2013 05:55 PM

chuck53

Re: Bayliner Bucaneer Cruise Speed Under Power

What is the mfg's rated WOT RPM? If more than 2500, you are over propped. Even if 2500 is the rated RPM, you should be able to run comfortably 2000 RPM's all day long.
So before doing anything, prop wise, find out the rated RPM for your engine.

This thread has more than 10 replies.
Click here to review the whole thread.